Description: New design cup shape, more delicate experience and simple installation. This product is a real steering wheel controller, which is not a remote controller. This product can support all the following functions: volume increase/ decrease, Bluetooth car phone dial/hang-up, up/down, etc. Easy and Fast to Install. Check your head unit user manual, enter into the head unit steering wheel setting page. Pay attention to SAVING the setting, then exit to use. Specification: Material: PU Power:2x AAA Battery(Not included) Size: 5.5x7.5cm Color: Black Package Includes: 1 x Wireless Steering Wheel Control Button 1 x User Manual Note: Conversion: 1inch=2.54cm, 1cm=0.393inch Please allow slightly 0-1cm difference due to manual measurement. Colors can appear different depending on light and how the listing is viewed. Thanks for your understanding and attention. Wish you a pleasant shopping experience!